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Or is it just one of Phil's balls in my throat?
I believe their testing was also done before the day 1 patch that will be out on release.
A 15GB update for the game came out 2 days ago, that's the equivalent of the day 1 patch, but you're right, most of the testing for this video was probably done even before that.
Oliver says they tested 20 hrs (and found no bugs).